54 



anterior bony prominence of the ilium, e, (Fig. 6), which is well marked 

 on every pelvis of the Ostrich that I have seen. The tendon of this 

 digastric muscle is united to that of the gastrocnemido-solceus, by a slip 

 shown at a, Fig. 9. 



The weight of the fleshy belly of the rectus femoris proper is 7j oz. 



13. M. sartorius. — This important and remarkable muscle arises from 

 the anterior portion of the ilium, g, (Fig. 6), and from some of the spines 

 of the lumbar vertebrae ; and, passing in the usual manner across the 

 inner aspect of the thigh, is inserted into the inner side of the liga- 

 m en turn patella? and into the top of the tibia ; its weight is . . 18 oz. 



14. M. iliacus — Has a lozenge-shaped origin on the anterior portion 

 of the ilium, between the opponens quaclrato femoris and glutceus minimus, 

 d, (Fig. 6). Its insertion into the femur is shown in Fig. 8, at a point 

 which must be supposed to represent the lesser trochanter; its weight 

 is . . If oz. 



15. M. gracilis arises, like the semitendinosus, from the tuber ischii, 

 and from the lower half of the ligament joining it to the posterior spine 

 of the ilium ; and is inserted into the fascia of the inner side of the knee 

 joint; its weight is 4 1 oz. 



16. 31. adductor magnus arises from the anterior half of the ischial 

 line, h, k (Fig. 6), and is inserted into the upper margin of the condy- 

 loid pit at the back and inner side of the femur (Fig. 7) ; its weight 

 is 4f oz. 



Its fibres were pale and fatty in the specimen dissected by me. 



17. M. pectincem arises from the pectineal point, I, (Fig. 6), and is in- 

 serted into the tibia on the inner side of the knee, and is intimately 

 connected by muscular fibres with vastus internus (2) ; its weight is 4 oz. 



Fig. 9. 

 I 



DIGASTRIC MUSCLE, 



Composed of rectus femoris and part of the flexor digitorum magnus. 



a, Tendinous slip, uniting the tendon of Digastric muscle with that of the Gastro- 



cnemido-solseus. 



b, Fleshy line of union with main body of the Flexor digitorum communis. 



The blending of the fibres of pectinmis with those of the vastus in- 

 ternus, a portion of which, like this muscle, terminates directly in the 

 tibia, is not to be forgotten in considering the mechanical action of the 

 muscles of the hip and knee joints. 



18. M. quadratus femoris has an origin on the ischial line, just below 

 that of the M. adductor magnus, and an insertion of a linear shape in the 

 back of the upper portion of the femur, shown in Fig. 7 ; its weight 

 is 2f oz. 



19. M. opponens quadrato femoris. — This muscle I have so named, 

 because it is met with in many animals as the direct opponent of the 



